[c-nsp] WCCP performance problem on a 7600

[Adrian Chadd]

On Fri, Apr 11, 2008, Charles Glass wrote:

> WCCP has been configured to use GRE forwarding and HASH assignment.

Bzzt!

> I understand that GRE forwarding with HASH assignment is not the
> preferred configuration for WCCP on a 7600 and that GRE is not
> supported in hardware.
> 
> Configuring L2 forwarding and HASH assignment yields no performance
> improvement from what I have seen.

Its probably being CPU punted!

> To make full use of hardware redirection the cache engines would need
> to be configured with L2 forwarding and mask assignment.

Well, why aren't you using mask assignment?

> Is anyone using L2 forwarding with MASK assignment?

Everyone I've spoken to doing WCCPv2 on the 6500/7600 ends up with
crap performance when not using L2/Mask, or great performance when
using L2/Mask.




Adrian